# Twilio Email Send API Message Delivery Delays to Microsoft Inboxes - Provider: [SendGrid](https://down.guide/providers/sendgrid) - Confidence: Confirmed - Impact: Degraded - lasted 1d 10h - started 2026-11-12 19:42 UTC - API v3, SMTP, API v2 - id: DWN-46c1aeb98d - Official page: https://stspg.io/6f5v3h5q1mkr ## Summary The provider says email delivery to Microsoft-hosted inboxes was delayed by a third-party provider dependency, with no mail loss. Delivery has returned to normal and deferred messages have been processed, and monitoring continues pending Microsoft's confirmation of full recovery. _Written by anthropic/claude-haiku-5.5 from SendGrid's own updates._ ## Updates from SendGrid ### 2026-11-12 19:42 UTC: investigating We have identified an issue with Email. Users may experience delays in message delivery to some inboxes hosted by Microsoft This does not impact mail send targeted to other inbox provider other than Microsoft. We will provide another update in 1 hour or as soon as more information becomes available. ### 2026-11-12 19:58 UTC: identified We have identified the issue of delayed email delivery to Microsoft inbox providers for Email. Due to a third-party provider dependency, messages to these inboxes may remain queued longer than usual, but there is no mail loss at this time. We will provide another update in 1 hour or as soon as more information becomes available. ### 2026-11-12 20:59 UTC: identified We have identified the issue of delayed email delivery to Microsoft inbox providers for Email Inbox Providers. Due to a third-party provider dependency, messages sent to these inboxes are being deferred and queued for later delivery. There is no mail loss at this time. We will provide another update in 2 hours or as soon as more information becomes available. ### 2026-11-12 22:59 UTC: identified We have identified the issue of delays in email delivery to Microsoft-hosted inboxes. Due to a third-party provider dependency, messages to these inboxes may continue to be deferred before delivery. Mail is continuing to queue and is not being dropped at this time. We will provide another update in 4 hours or as soon as more information becomes available. ### 2026-11-13 03:02 UTC: identified We have identified the issue of delays in email delivery to Microsoft inbox providers. Due to a third-party provider dependency, messages may continue to be deferred before reaching recipient inboxes, though no mail is being dropped at this time. We will provide another update by 10:00PM PST or as soon as more information becomes available. ### 2026-11-13 06:18 UTC: identified We have identified the issue of delayed email delivery to Microsoft inboxes. Due to a third-party provider dependency, messages may continue to be deferred before reaching recipient inboxes, though mail send is not impacted and queued messages will continue to retry. We will provide another update by 7:00AM PST or as soon as more information becomes available. ### 2026-11-13 09:35 UTC: identified We have identified the issue of delayed email delivery to Microsoft inboxes for Email. Due to a third-party provider dependency, some messages may continue to be deferred before reaching recipient inboxes, though delivery rates are showing improvement and recovery is still in progress. No mail send impact is expected, and delayed messages will continue to be retried. We will provide another update at 7:00 AM or as soon as more information becomes available. ### 2026-11-13 09:54 UTC: identified We have identified the issue of delayed email delivery to Microsoft inboxes. Due to a third-party provider dependency, some messages may continue to be deferred before reaching recipient inboxes, though we are seeing early signs of stabilization and improvement. Delayed messages continue to be retried and preserved for delivery as service recovery progresses. We will provide another update in 1 hour, 18 minutes or as soon as more information becomes available. ### 2026-11-13 14:32 UTC: identified We have identified the issue of delayed email delivery to Microsoft inboxes for Email. Due to a third-party provider dependency, some messages may continue to be deferred before reaching recipient inboxes, though we are seeing continued improvement as queued messages are retried automatically and delivery progresses toward normal levels. No action is required from customers at this time. We will provide another update in 2 hours or as soon as more information becomes available. ### 2026-11-13 14:39 UTC: identified We have identified the issue of delayed email delivery to Microsoft inboxes for Email. Due to a third-party provider dependency, some messages may continue to be deferred before reaching recipient inboxes, though we are seeing continued improvement as queued messages are retried automatically and delivery progresses toward normal levels. No action is required from customers at this time. We will provide another update in 2 hours or as soon as more information becomes available. ### 2026-11-13 15:16 UTC: identified We have identified the issue of delayed email delivery to Microsoft inboxes for Email. Due to a third-party provider dependency, delivery rates continue to improve, though some messages may still be deferred before reaching recipient inboxes. Deferred messages continue to be retried and preserved for delivery as recovery progresses, and no action is required from customers at this time. We will provide another update in an hour or as soon as more information becomes available. ### 2026-11-13 16:27 UTC: identified We have identified the issue of delayed email delivery to Microsoft inboxes for the Twilio Email Send API. Due to a third-party provider dependency, delivery rates continue to improve, but some messages may still be deferred before reaching recipient inboxes. Delayed messages continue to be retried and preserved for delivery as service recovery progresses. This does not impact mail send. We will provide another update in 2 hours or as soon as more information becomes available. ### 2026-11-13 18:45 UTC: monitoring Mail Delivery to Microsoft Inboxes has recovered at its pre-incident level and we continue to monitor and will provide another update in 2 hours or as soon as more information becomes available. ### 2026-11-13 23:00 UTC: monitoring Email delivery to Microsoft inboxes has returned to normal levels, and previously deferred messages have been processed. We will continue to monitor until we get a confirmation from MSFT that the outage is fully recovered and we will provide another update in 2 hours or as soon as more information becomes available. ### 2026-11-14 01:06 UTC: monitoring Email delivery to Microsoft inboxes has returned to normal levels and previously deferred messages have been processed. We will continue to monitor until we get a confirmation from MSFT that the outage is fully recovered and we will provide another update as soon as more information becomes available. ### 2026-11-14 05:51 UTC: resolved We have monitored and resolved the issue with the Twilio Email Send API. All services are now operating normally at this time. From the builder: does your app depend on SendGrid? [Sazabi](https://www.sazabi.com/?utm_source=down-guide&utm_medium=markdown&utm_content=sendgrid) detects problems in your own logs without hand-written monitors, and you can ask it in plain language which errors mention SendGrid. --- down.guide reads providers' official status pages every minute and adds its own evidence, always labeled. Free, no account. Agents: MCP at https://down.guide/mcp, REST at https://down.guide/api/v1, feeds at https://down.guide/feed. 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